[PATCH v4 0/4] ARM: i.MX8: add DDRC-ECC support

[Steffen Trumtrar <s.trumtrar@pengutronix.de>]

The i.MX8 DDRC controller supports using inline ECC with the DDR RAM.
Inline ECC reduces the usable RAM size by 1/8: 7/8 RAM is for data and
1/8 RAM is for the ECC bits. Also, measuring random memory writes in
linux with

    stress-ng --memthrash 4 --memthrash-method chunk1 -t 1m --metrics

shows a performance decrease by ~10%.

If a board wants to support ECC, the lpddr4 RAM settings in the
according lpddr4-timing-* must be adapted to enable and configure the
ECC registers.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
Changes in v4:
- rebase to 2026.03.0
- rework functioncalls in esdctl accordingly
- Link to v3: https://lore.barebox.org/20260311-v2026-02-0-topic-imx8-ecc-v3-0-ffdf97760441@pengutronix.de

Changes in v3:
- move timing struct to own noinline function
- rename dram_timing_info->size -> dram_timing_info->ecc_full_size
- replace #ifdef with IS_ENABLED
- add defines for ECC_STRIDE/INLINE/SCRUB_SIZE
- remove imx8mq-ddrc, only quad x plus has ecc
- Fix kconfig text
- Link to v2: https://lore.barebox.org/20260309-v2026-02-0-topic-imx8-ecc-v2-0-6aab6d795061@pengutronix.de

Changes in v2:
- prt8ml: move ram timings to header
- prt8ml: build two images: with and without ecc
- add RAM size and scrubbing function to generic code
- Link to v1: https://lore.barebox.org/20260304-v2026-02-0-topic-imx8-ecc-v1-0-700698530c5c@pengutronix.de

---
David Jander (3):
      arm: mach-imx: esdctl.c: Add support for imx8mp inline ECC
      drivers: ddr: imx8m: ddr_init.c: support ECC scrubbing
      arm: boards: protonic-imx8ml: Add ECC + scrubbing

Steffen Trumtrar (1):
      ARM: i.MX: esdctl: fix spelling of ad(d)ress

 arch/arm/boards/protonic-imx8m/Makefile            |    2 +-
 arch/arm/boards/protonic-imx8m/lowlevel-prt8ml.c   |   29 +-
 .../protonic-imx8m/lpddr4-timing-prt8ml-ecc.c      |   26 +
 .../boards/protonic-imx8m/lpddr4-timing-prt8ml.c   | 1100 +------------------
 .../boards/protonic-imx8m/lpddr4-timing-prt8ml.h   | 1123 ++++++++++++++++++++
 arch/arm/dts/imx8mp-prt8ml.dts                     |   10 +-
 arch/arm/mach-imx/Kconfig                          |   11 +
 arch/arm/mach-imx/esdctl.c                         |   87 +-
 drivers/ddr/imx/imx8m_ddr_init.c                   |   96 ++
 images/Makefile.imx                                |    2 +
 include/soc/imx/ddr.h                              |    1 +
 include/soc/imx8m/ddr.h                            |    2 +
 12 files changed, 1377 insertions(+), 1112 deletions(-)
---
base-commit: 844d4cb7a087a87288bbde4652c3fca8186987b8
change-id: 20260304-v2026-02-0-topic-imx8-ecc-9206fee1f037

Best regards,
-- 
Steffen Trumtrar <s.trumtrar@pengutronix.de>